The Top 10 Reasons To Be In Data Communications A humorous introduction to the world of data communications. Goldman's Laws of Data Communications The "Laws" of data communications from your book publisher's point of view. OSI Reference Model The seven layer Open Systems Interconnect (OSI) reference model - MEMORIZE THIS DIAGRAM!!! Common Data Network Symbols Cisco symbols for the most commonly used data network devices. ASCII Table This table translates keyboard characters into their Hexadecimal and Decimal Values. Organized by most significant bit (MSB) values. Electricity A brief explaination/refresher of how electricity works. IEEE 1394 Home Entertainment Overview PDF file produced by the IEEE 1394 Trade Association EIA/TIA 568a/568b Wiring EIA/TIA 568a & 568b wiring diagrams. Ethernet: Distributed Packet Switching for Local Computer Networks This is a PDF of the seminal document written by Robert Metcalfe and David Boggs while working on the development of Ethernet at Xerox's Palo ALto Research Center (PARC) in 1974. It was later published by the Association of Computing Machinery's in July, 1976. Compare & Contrast OSI Layers 1 & 2 A diagram illustrating different technologies used at layers 1 and 2 of the OSI model. Collision & Broadcast Domain Comparison This video lecture will help you understand the difference between a collision domain and a broadcast domain. Digital Cross-Connect Photograph of a digital cross-connect in a phone switching center. Tandem Office Diagram illustrating how tandem offices hand-off phone calls. DSL This document describes how DSL, the Digital Subscriber Line, works. DOD/OSI Model Comparison The four layer DOD model mapped side-by-side with the seven layer OSI model. Data Formats and the major TCP/IP protocols are also listed according to their assigned layers. Serial Transmission Standards Read this document for help on learning serial transmission standards like RS-232, USB, and IEEE 1394 (Firewire). Subnetting Tutorial Read this document for help on learning how to subnet IP-based networks. Subnet Table Binary to Decimal conversion table. A "Must Know" for all CIS students. Subnetting Practice Form Test your knowledge of subnet design. Wireless Networks Web-based lecture on wireless network technologies. Wireless Voice Transmission and Cellular Standards PDF file which discusses wireless voice transmission methods and cellular standards.